I stood behind a rather rotund individual the other week in the pie queue...now I am scoffing pies, burgers, chips etc all the time, perhaps I caught something from them...no hang on I was scoffing these things before that. I believe the need to stuff your face with unhealthy food is due to a defective gene, it is called the greedypigneverknowwhenivehadenough gene. ;)))
Obesity is caused by eating too much. That's all there is too it. Fat people who say they only eat enough to feed a sparrow and other such nonsense are deluding themselves. Fat cannot be generated from nothing* so it has to be fed in - usually via the mouth.
Have to agree with you, I am the reverse of your good self. I put on weight really easyily although through a good diet and exercise I can also lose it easily too. The problem as I see it is in this day and age people see dieting as something you do a few months in a year before going on holidays etc. A good diet is a lifestyle change and is something that should be continued.
Why put on fat when you can build yourself up with muscle. Muscle being denser than fat weighs more per unit volume. You will gain weight without looking like a blimp and you can also kick seven bells out of the smug sods who imagine they are their ideal weight and have no time for anyone with a weight problem.